Solar panel



FIG. 1 is a first front perspective view showing a design for a solar panel;

FIG. 2 is a second front perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a top view thereof.

The broken lines shown represent portions of the solar panel that form no part of the claimed design. 

CLAIM The ornamental design of a solar panel, as shown and described. 